Until recently, sdhci_ops was used only for overriding IO accessors.
(so, host->ops was not set by any drivers except bcm2835_sdhci.c)
Now, we have more optional callbacks, get_cd, set_control_reg, and
set_clock. However, the code
if (host->ops->get_cd)
host->ops->get_cd(host);
... expects host->ops is set for all drivers.
Commit 5e96217f04 ("mmc: pic32_sdhci: move the code to
pic32_sdhci.c") and commit 62226b6863 ("mmc: sdhci: move the
callback function into sdhci_ops") added sdhci_ops for pic32_sdhci.c
and s5p_sdhci.c, but the other drivers still do not (need not) set
host->ops because all callbacks in sdhci_ops are optional.
host->ops must be checked to avoid the system crash caused by NULL
pointer access.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
bf9c4d1464