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be2iscsi: Add lock to protect WRB alloc and free

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FW got into UE after running IO stress test

With kernel change to split session lock in frwd_lock and back_lock for
tx and rx path correspondingly, in the IO path, common resource used in
driver such as WRB was left unprotected.

Add wrb_lock spinlock to protect allocation and freeing of WRB.

Signed-off-by: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Jitendra Bhivare 2016-02-04 15:49:20 +05:30 committed by Martin K. Petersen
parent 10139fe021
commit f64d92e665
2 changed files with 6 additions and 0 deletions
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5
drivers/scsi/be2iscsi/be_main.c
View file

@ -1190,12 +1190,14 @@ beiscsi_get_wrb_handle(struct hwi_wrb_context *pwrb_context,
{
struct wrb_handle *pwrb_handle;
spin_lock_bh(&pwrb_context->wrb_lock);
pwrb_handle = pwrb_context->pwrb_handle_base[pwrb_context->alloc_index];
pwrb_context->wrb_handles_available--;
if (pwrb_context->alloc_index == (wrbs_per_cxn - 1))
pwrb_context->alloc_index = 0;
else
pwrb_context->alloc_index++;
spin_unlock_bh(&pwrb_context->wrb_lock);
return pwrb_handle;
}
@ -1227,12 +1229,14 @@ beiscsi_put_wrb_handle(struct hwi_wrb_context *pwrb_context,
struct wrb_handle *pwrb_handle,
unsigned int wrbs_per_cxn)
{
spin_lock_bh(&pwrb_context->wrb_lock);
pwrb_context->pwrb_handle_base[pwrb_context->free_index] = pwrb_handle;
pwrb_context->wrb_handles_available++;
if (pwrb_context->free_index == (wrbs_per_cxn - 1))
pwrb_context->free_index = 0;
else
pwrb_context->free_index++;
spin_unlock_bh(&pwrb_context->wrb_lock);
}
/**
@ -2920,6 +2924,7 @@ static int beiscsi_init_wrb_handle(struct beiscsi_hba *phba)
}
num_cxn_wrbh--;
}
spin_lock_init(&pwrb_context->wrb_lock);
}
idx = 0;
for (index = 0; index < phba->params.cxns_per_ctrl; index++) {

1
drivers/scsi/be2iscsi/be_main.h
View file

@ -304,6 +304,7 @@ struct invalidate_command_table {
#define BEISCSI_GET_ULP_FROM_CRI(phwi_ctrlr, cri) \
(phwi_ctrlr->wrb_context[cri].ulp_num)
struct hwi_wrb_context {
spinlock_t wrb_lock;
struct list_head wrb_handle_list;
struct list_head wrb_handle_drvr_list;
struct wrb_handle **pwrb_handle_base;