Patch 1 of 1 cciss: fix lost command problem From: Bud Brown <bud.brown@xxxxxxxxxx> Under certain workloads a command may seem to get lost. IOW, the Smart Array thinks all commands have been completed but we still have commands in our completion queue. This may lead to system instability, filesystems going read-only, or even panics depending on the affected filesystem. We add an extra read to force the write to complete. Testing shows this extra read avoids the problem. Signed-off-by: Mike Miller <mike.miller@xxxxxx> diff -urNp linux-2.6/drivers/block/cciss.h linux-2.6-03212011/drivers/block/cciss.h --- linux-2.6/drivers/block/cciss.h 2011-03-21 15:41:23.100192400 -0500 +++ linux-2.6-03212011/drivers/block/cciss.h 2011-03-21 15:39:20.472192814 -0500 @@ -222,6 +222,7 @@ static void SA5_submit_command( ctlr_inf h->ctlr, c->busaddr); #endif /* CCISS_DEBUG */ writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET); + readl(h->vaddr + SA5_REQUEST_PORT_OFFSET); h->commands_outstanding++; if ( h->commands_outstanding > h->max_outstanding) h->max_outstanding = h->commands_outstanding; -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
