sr: Remove in_interrupt() usage in sr_init_command().

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>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index fd4b582..e4633b8 100644 (file)
--- 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 @@ error_out:
 
 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)