mmc_spi: fail gracefully if host or card do not support the switch command

Some time ago, I have send a patch to the mmc_spi subsystem changing the
error codes.  This was after a discussion with Pierre about using EINVAL
only for non-recoverable errors.  This patch was accepted as

http://git.kernel.org/linus/fdd858db7113ca64132de390188d7ca00701013d

Unfortunately, several weeks later, I realized that this patch has opened
a little can of worms because there are SD cards on the market which

a) claim that they support the switch command
AND
b) refuse to execute this command if operating in SPI mode.

So, such a card would get unusuable in an embedded linux system in SPI
mode, because the init sequence terminates with an error.

This patch adds the missing error codes to the caller of the switch
command and restores the old behaviour to fail gracefully if these
commands can not execute.

Signed-off-by: Wolfgang Muees <wolfgang.mues@auerswald.de>
Cc: <linux-mmc@vger.kernel.org>
Cc: <stable@kernel.org>		[2.6.31.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index a6b5fe9d396959befe1e9e8cb88b4abd8f15fb5b..ddddad46b402efcbe56181678c3f43c68ccfa1d3 100644 (file)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -179,11 +179,11 @@ static int mmc_read_ext_csd(struct mmc_card *card)
 
        err = mmc_send_ext_csd(card, ext_csd);
        if (err) {
-               /*
-                * We all hosts that cannot perform the command
-                * to fail more gracefully
-                */
-               if (err != -EINVAL)
+               /* If the host or the card can't do the switch,
+                * fail more gracefully. */
+               if ((err != -EINVAL)
+                && (err != -ENOSYS)
+                && (err != -EFAULT))
                        goto out;
 
                /*

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 222a60928cdbfe3d9da0670a760fe55574f61610..13b3a6b8f5b59eeda498dd37e3c89b89c5b8a000 100644 (file)
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -210,11 +210,11 @@ static int mmc_read_switch(struct mmc_card *card)
 
        err = mmc_sd_switch(card, 0, 0, 1, status);
        if (err) {
-               /*
-                * We all hosts that cannot perform the command
-                * to fail more gracefully
-                */
-               if (err != -EINVAL)
+               /* If the host or the card can't do the switch,
+                * fail more gracefully. */
+               if ((err != -EINVAL)
+                && (err != -ENOSYS)
+                && (err != -EFAULT))
                        goto out;
 
                printk(KERN_WARNING "%s: problem reading switch "