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authorJulian Wiedmann <jwi@linux.ibm.com>2019-07-11 18:17:36 +0200
committerHeiko Carstens <heiko.carstens@de.ibm.com>2019-07-23 10:43:55 +0200
commita6ec414a4dd529eeac5c3ea51c661daba3397108 (patch)
tree777ed0945b271b076af78d01b4f04b4da34d7f91 /Documentation/s390
parent6abe28197024f732f1e298b1a593505282505857 (diff)
downloadlinux-a6ec414a4dd529eeac5c3ea51c661daba3397108.tar.bz2
s390/qdio: add sanity checks to the fast-requeue path
If the device driver were to send out a full queue's worth of SBALs, current code would end up discovering the last of those SBALs as PRIMED and erroneously skip the SIGA-w. This immediately stalls the queue. Add a check to not attempt fast-requeue in this case. While at it also make sure that the state of the previous SBAL was successfully extracted before inspecting it. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Reviewed-by: Jens Remus <jremus@linux.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'Documentation/s390')
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