[CIFS] rmmod cifs can oops if done soon after the last cifs unmount
Signed-off-by: Shaggy (shaggy@austin.ibm.com) Signed-off-by: Steve French (sfrench@us.ibm.com)
This commit is contained in:
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1982c344f1
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f191401f59
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@ -834,8 +834,8 @@ static int cifs_oplock_thread(void * dummyarg)
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spin_unlock(&GlobalMid_Lock);
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}
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} while(!signal_pending(current));
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complete_and_exit (&cifs_oplock_exited, 0);
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oplockThread = NULL;
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complete_and_exit (&cifs_oplock_exited, 0);
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}
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static int __init
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@ -29,6 +29,7 @@
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#include <linux/utsname.h>
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#include <linux/mempool.h>
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#include <linux/delay.h>
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#include <linux/completion.h>
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#include <asm/uaccess.h>
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#include <asm/processor.h>
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#include "cifspdu.h"
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@ -44,6 +45,8 @@
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#define CIFS_PORT 445
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#define RFC1001_PORT 139
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static DECLARE_COMPLETION(cifsd_complete);
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extern void SMBencrypt(unsigned char *passwd, unsigned char *c8,
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unsigned char *p24);
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extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
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@ -339,6 +342,7 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server)
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atomic_inc(&tcpSesAllocCount);
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length = tcpSesAllocCount.counter;
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write_unlock(&GlobalSMBSeslock);
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complete(&cifsd_complete);
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if(length > 1) {
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mempool_resize(cifs_req_poolp,
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length + cifs_min_rcv,
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@ -676,7 +680,7 @@ multi_t2_fnd:
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msleep(125);
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}
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if (list_empty(&server->pending_mid_q)) {
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if (!list_empty(&server->pending_mid_q)) {
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/* mpx threads have not exited yet give them
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at least the smb send timeout time for long ops */
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/* due to delays on oplock break requests, we need
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@ -713,7 +717,7 @@ multi_t2_fnd:
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GFP_KERNEL);
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}
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msleep(250);
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complete_and_exit(&cifsd_complete, 0);
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return 0;
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}
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@ -1617,8 +1621,9 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
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kfree(volume_info.password);
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FreeXid(xid);
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return rc;
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} else
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rc = 0;
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}
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wait_for_completion(&cifsd_complete);
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rc = 0;
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memcpy(srvTcp->workstation_RFC1001_name, volume_info.source_rfc1001_name,16);
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srvTcp->sequence_number = 0;
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}
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@ -1759,8 +1764,10 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
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spin_lock(&GlobalMid_Lock);
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srvTcp->tcpStatus = CifsExiting;
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spin_unlock(&GlobalMid_Lock);
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if(srvTcp->tsk)
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if(srvTcp->tsk) {
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send_sig(SIGKILL,srvTcp->tsk,1);
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wait_for_completion(&cifsd_complete);
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}
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}
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/* If find_unc succeeded then rc == 0 so we can not end */
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if (tcon) /* up accidently freeing someone elses tcon struct */
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@ -1773,8 +1780,10 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
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temp_rc = CIFSSMBLogoff(xid, pSesInfo);
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/* if the socketUseCount is now zero */
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if((temp_rc == -ESHUTDOWN) &&
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(pSesInfo->server->tsk))
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(pSesInfo->server->tsk)) {
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send_sig(SIGKILL,pSesInfo->server->tsk,1);
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wait_for_completion(&cifsd_complete);
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}
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} else
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cFYI(1, ("No session or bad tcon"));
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sesInfoFree(pSesInfo);
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@ -3241,8 +3250,10 @@ cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
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return 0;
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} else if (rc == -ESHUTDOWN) {
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cFYI(1,("Waking up socket by sending it signal"));
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if(cifsd_task)
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if(cifsd_task) {
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send_sig(SIGKILL,cifsd_task,1);
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wait_for_completion(&cifsd_complete);
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}
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rc = 0;
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} /* else - we have an smb session
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left on this socket do not kill cifsd */
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