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authorDavid S. Miller <davem@davemloft.net>2009-06-23 16:01:06 -0700
committerDavid S. Miller <davem@davemloft.net>2009-06-24 00:32:30 -0700
commitaf054ed0018f0a69f8ea6f7546cbf34385edf13b (patch)
tree3c83e7452f6e0ecb14a278ab833626fa3e51a687 /drivers/ide/ide-cd.c
parentffc36c7610731115c77700dcc53901920361c235 (diff)
downloadlwn-af054ed0018f0a69f8ea6f7546cbf34385edf13b.tar.gz
lwn-af054ed0018f0a69f8ea6f7546cbf34385edf13b.zip
ide-cd: Don't warn on bogus block size unless it actually matters.
Frans Pop reported that his CDROM drive reports a blocksize of 2352, and this causes new warnings due to commit e8e7b9eb11c34ee18bde8b7011af41938d1ad667 ("ide-cd: fix oops when using growisofs"). What we're trying to do is make sure that "blocklen >> SECTOR_BITS" is something the block layer won't choke on. And for Frans' case "2352 >> SECTOR_BITS" is equal to "2048 >> SECTOR_BITS", and thats "4". So warning in this case gives no real benefit. Reported-by: Frans Pop <elendil@planet.nl> Tested-by: Frans Pop <elendil@planet.nl> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ide/ide-cd.c')
-rw-r--r--drivers/ide/ide-cd.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 4a19686fcfe9..a9a1bfb14e7c 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -876,9 +876,12 @@ static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
return stat;
/*
- * Sanity check the given block size
+ * Sanity check the given block size, in so far as making
+ * sure the sectors_per_frame we give to the caller won't
+ * end up being bogus.
*/
blocklen = be32_to_cpu(capbuf.blocklen);
+ blocklen = (blocklen >> SECTOR_BITS) << SECTOR_BITS;
switch (blocklen) {
case 512:
case 1024: