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authorArnd Bergmann <arnd@arndb.de>2014-06-26 13:43:02 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2014-07-03 21:42:10 +0800
commite1f8859ee265fc89bd21b4dca79e8e983a044892 (patch)
tree018e9e6dc1b60987d39180e5f10605f03a72be6e /Documentation/isapnp.txt
parent263a8df0d32eca17693f80f8cde416c9312a2239 (diff)
crypto: ux500 - make interrupt mode plausible
The interrupt handler in the ux500 crypto driver has an obviously incorrect way to access the data buffer, which for a while has caused this build warning: ../ux500/cryp/cryp_core.c: In function 'cryp_interrupt_handler': ../ux500/cryp/cryp_core.c:234:5: warning: passing argument 1 of '__fswab32' makes integer from pointer without a cast [enabled by default] writel_relaxed(ctx->indata, ^ In file included from ../include/linux/swab.h:4:0, from ../include/uapi/linux/byteorder/big_endian.h:12, from ../include/linux/byteorder/big_endian.h:4, from ../arch/arm/include/uapi/asm/byteorder.h:19, from ../include/asm-generic/bitops/le.h:5, from ../arch/arm/include/asm/bitops.h:340, from ../include/linux/bitops.h:33, from ../include/linux/kernel.h:10, from ../include/linux/clk.h:16, from ../drivers/crypto/ux500/cryp/cryp_core.c:12: ../include/uapi/linux/swab.h:57:119: note: expected '__u32' but argument is of type 'const u8 *' static inline __attribute_const__ __u32 __fswab32(__u32 val) There are at least two, possibly three problems here: a) when writing into the FIFO, we copy the pointer rather than the actual data we want to give to the hardware b) the data pointer is an array of 8-bit values, while the FIFO is 32-bit wide, so both the read and write access fail to do a proper type conversion c) This seems incorrect for big-endian kernels, on which we need to byte-swap any register access, but not normally FIFO accesses, at least the DMA case doesn't do it either. This converts the bogus loop to use the same readsl/writesl pair that we use for the two other modes (DMA and polling). This is more efficient and consistent, and probably correct for endianess. The bug has existed since the driver was first merged, and was probably never detected because nobody tried to use interrupt mode. It might make sense to backport this fix to stable kernels, depending on how the crypto maintainers feel about that. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: linux-crypto@vger.kernel.org Cc: Fabio Baltieri <fabio.baltieri@linaro.org> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "David S. Miller" <davem@davemloft.net> Cc: stable@vger.kernel.org Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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