From 6abaa0c9fec563538f2a28a682af8c89bb9b125c Mon Sep 17 00:00:00 2001 From: Pierre Ossman Date: Tue, 1 May 2007 16:00:02 +0200 Subject: mmc: support unsafe resume of cards Since many have the system root on MMC/SD we must allow some foot shooting when it comes to resume. We cannot detect if a card is removed and reinserted during suspend, so the safe approach would be to assume it was, avoiding potential filesystem corruption. This will of course not work if you cannot release the card before suspend. This commit adds a compile time option that makes the MMC layer assume the card wasn't touched if it is redetected upon resume. Signed-off-by: Pierre Ossman --- drivers/mmc/core/Kconfig | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) create mode 100644 drivers/mmc/core/Kconfig (limited to 'drivers/mmc/core/Kconfig') diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig new file mode 100644 index 00000000000..94222b9a15e --- /dev/null +++ b/drivers/mmc/core/Kconfig @@ -0,0 +1,17 @@ +# +# MMC core configuration +# + +config MMC_UNSAFE_RESUME + bool "Allow unsafe resume (DANGEROUS)" + depends on MMC != n + help + If you say Y here, the MMC layer will assume that all cards + stayed in their respective slots during the suspend. The + normal behaviour is to remove them at suspend and + redetecting them at resume. Breaking this assumption will + in most cases result in data corruption. + + This option is usually just for embedded systems which use + a MMC/SD card for rootfs. Most people should say N here. + -- cgit v1.2.3