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scsi: cxlflash: Fix vlun resize failure in the shrink path 

The ioctl DK_CAPI_VLUN_RESIZE can fail if the allocated vlun size is
reduced from almost maximum capacity and then increased again.

The shrink_lxt() routine is currently using the SISL_ASTATUS_MASK to
mask the higher 48 bits of the lxt entry. This is unnecessary and
incorrect as it uses a mask designed for the asynchronous interrupt
status register.  When the 4 port support was added to cxlflash, the
SISL_ASTATUS_MASK was updated to reflect the status bits for all 4
ports. This change indirectly affected the shrink_lxt() code path.

To extract the base, simply shift the bits without masking.

Fixes: 5651807232 ("scsi: cxlflash: SISlite updates to support 4 ports")
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
zero-colors
Uma Krishnan 2017-08-25 17:18:12 -05:00 committed by Martin K. Petersen
parent 1a9e394154
commit 07a191f762
1 changed files with 1 additions and 5 deletions
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6
drivers/scsi/cxlflash/vlun.c
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@ -694,11 +694,7 @@ static int shrink_lxt(struct afu *afu,
/* Free LBAs allocated to freed chunks */
mutex_lock(&blka->mutex);
for (i = delta - 1; i >= 0; i--) {
/* Mask the higher 48 bits before shifting, even though
* it is a noop
*/
aun = (lxt_old[my_new_size + i].rlba_base & SISL_ASTATUS_MASK);
aun = (aun >> MC_CHUNK_SHIFT);
aun = lxt_old[my_new_size + i].rlba_base >> MC_CHUNK_SHIFT;
if (needs_ws)
write_same16(sdev, aun, MC_CHUNK_SIZE);
ba_free(&blka->ba_lun, aun);