mmc: core: check for zero length ioctl data

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If the read or write buffer size associated with the command sent
through the mmc_blk_ioctl is zero, do not prepare data buffer.

This enables a ioctl(2) call to for instance send a MMC_SWITCH to set
a byte in the ext_csd.

Signed-off-by: Johan Rudholm <johan.rudholm@stericsson.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

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Johan Rudholm 2011-11-23 09:05:58 +01:00 • committed by Chris Ball

parent 4ee5ebaf74

commit 4d6144de8b

1 changed files with 45 additions and 37 deletions

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82

drivers/mmc/card/block.c

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