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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	"Ahmed S . Darwish" <a.darwish@linutronix.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [PATCH 3/3] sr: Remove in_interrupt() usage in sr_init_command().
Date: Fri,  4 Dec 2020 17:48:50 +0100	[thread overview]
Message-ID: <20201204164850.2343359-3-bigeasy@linutronix.de> (raw)
In-Reply-To: <20201204164850.2343359-1-bigeasy@linutronix.de>

The in_interrupt() check in sr_init_command() is a leftover from the
past, pre v2.3.16 era to be exact. Back then the ioctl() was served by
`sr' itself and sector size changes by CDROMREADMODE2 (as noted in the
comment) were accounted within sr's data structures which allowed a
"lazy" reset so it could be skipped on the next request and reset back
to the default value once the device node was closed or before a command
from the blockqueue was issued.

This does not work like that anymore. The CDROMREADMODE2 is served by
cdrom's mmc_ioctl() function which may change the sector size but the
`sr' driver does not learn about it and so its ->sector_size is not
updated.
The ioctl() resets the changed sector size back to 2048.
sr_read_sector() also resets the sector size back to the default once it
is done.

Remove the conditional sector size update from sr_init_command() and
sr_release() because it is not needed.

Link: https://lkml.kernel.org/r/20201204164803.ovwurzs3257em2rp@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
This change makes also ide-cd providing the last non-empty
cdrom_device_info::release callback.

 drivers/scsi/sr.c | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index fd4b582110b29..e4633b84c556a 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -416,19 +416,7 @@ static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)
 		goto out;
 	}
 
-	/*
-	 * we do lazy blocksize switching (when reading XA sectors,
-	 * see CDROMREADMODE2 ioctl) 
-	 */
 	s_size = cd->device->sector_size;
-	if (s_size > 2048) {
-		if (!in_interrupt())
-			sr_set_blocklength(cd, 2048);
-		else
-			scmd_printk(KERN_INFO, SCpnt,
-				    "can't switch blocksize: in interrupt\n");
-	}
-
 	if (s_size != 512 && s_size != 1024 && s_size != 2048) {
 		scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
 		goto out;
@@ -701,11 +689,6 @@ static int sr_open(struct cdrom_device_info *cdi, int purpose)
 
 static void sr_release(struct cdrom_device_info *cdi)
 {
-	struct scsi_cd *cd = cdi->handle;
-
-	if (cd->device->sector_size > 2048)
-		sr_set_blocklength(cd, 2048);
-
 }
 
 static int sr_probe(struct device *dev)
-- 
2.29.2


  parent reply	other threads:[~2020-12-04 16:49 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-04 16:48 [PATCH 0/3] Remove in_interrupt() usage in sr Sebastian Andrzej Siewior
2020-12-04 16:48 ` [PATCH 1/3] cdrom: Reset sector_size back it is not 2048 Sebastian Andrzej Siewior
2020-12-04 16:48   ` [PATCH 2/3] sr: Switch the sector size back to 2048 if sr_read_sector() changed it Sebastian Andrzej Siewior
2020-12-04 16:48   ` Sebastian Andrzej Siewior [this message]
2020-12-11 17:09     ` [PATCH 3/3] sr: Remove in_interrupt() usage in sr_init_command() Sebastian Andrzej Siewior
2020-12-12 18:12 ` [PATCH 0/3] Remove in_interrupt() usage in sr Jens Axboe

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