[SCSI] qla4xxx: Fixed request queue count manipulation on response path

Browse source

Issue:
Request queue count holds the information about free space in request queue
which has to be manipulated based on request in and out pointer.
But in driver response path, this count was incremented unconditionally,
which could move req_in pointer beyond req_out pointer.
This scenario leads fw hang during IO.

Solution:
Request queue count manipulation has to be done in IO path only, keeping
req_in and req_out pointer two IOCB count away

Signed-off-by: Tej Parkash <tej.parkash@qlogic.com>
Signed-off-by: Shyam Sundar <shyam.sundar@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

...

This commit is contained in:

Tej Parkash 2013-03-07 05:43:13 -05:00 • committed by James Bottomley

parent 33338e3183

commit a24058f9c2

3 changed files with 2 additions and 17 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

drivers/scsi/qla4xxx/ql4_glbl.h

View file

2

drivers/scsi/qla4xxx/ql4_isr.c

View file

15

drivers/scsi/qla4xxx/ql4_os.c

View file