On Mon, Jan 16, 2023 at 03:23:46PM +0100, Paul Menzel wrote: > Dear Linux folks, > > > Could you please apply commit 0c25422d34b4 (scsi: mpt3sas: Remove > scsi_dma_map() error messages) to the 5.15.y series? > > commit 0c25422d34b4726b2707d5f38560943155a91b80 > Author: Sreekanth Reddy <sreekanth.reddy@xxxxxxxxxxxx> > Date: Thu Mar 3 19:32:03 2022 +0530 > > scsi: mpt3sas: Remove scsi_dma_map() error messages > > When scsi_dma_map() fails by returning a sges_left value less than zero, > the amount of logging produced can be extremely high. In a recent > end-user > environment, 1200 messages per second were being sent to the log buffer. > This eventually overwhelmed the system and it stalled. > > These error messages are not needed. Remove them. > > Link: > https://lore.kernel.org/r/20220303140203.12642-1-sreekanth.reddy@xxxxxxxxxxxx > Suggested-by: Christoph Hellwig <hch@xxxxxx> > Signed-off-by: Sreekanth Reddy <sreekanth.reddy@xxxxxxxxxxxx> > Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> > > We see this regression after upgrading from Linux 5.10 to 5.15 on our file > servers with Broadcom/LSI SAS3008 PCI-Express Fusion-MPT SAS-3 (mpt3sas) – > though luckily our systems do not stall/crash. > > The commit message does not say anything about, what commit caused these > error to be appearing – the log statements have been there since v4.20-rc1, > if I am not mistaken, so it must be something else –, and also do not > mention, why these log messages are not needed, but the new error condition > is actually expected. Now queued up, thanks. greg k-h
