[PATCH] i2c: at91: fix crash when using 'i2c probe'

[Heiko Schocher]

Hello Eugen,

On 04.12.20 17:06, Eugen Hristev wrote:
> When issuing 'i2c probe', the driver was crashing, because at probe
> there is a request with zero length buffer to write to i2c bus.
> The xfer_msg function assumes the buffer is always there, and never
> checks for the buffer length.
> 
> => i2c dev 0
> Setting bus to 0
> => i2c probe
> Valid chip addresses:
> data abort
> pc : [<7ffa97dc>]          lr : [<7ffa96f8>]
> reloc pc : [<66f277dc>]    lr : [<66f276f8>]
> sp : 7fb7c110  ip : 7ff87a28     fp : 7ff99938
> r10: 00000002  r9 : 7fb7dec0     r8 : 00000000
> r7 : e181c600  r6 : 7fb88c20     r5 : 00000000  r4 : 7fb7c128
> r3 : 00000000  r2 : 00000001     r1 : 00000000  r0 : 00000009
> Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
> Code: eb0092f4 e1a00005 e8bd81f0 e594300c (e5d33000)
> Resetting CPU ...
> 
> Fixes: 8800e0fa20 ("i2c: atmel: add i2c driver")
> Signed-off-by: Eugen Hristev <eugen.hristev at microchip.com>
> ---
>  drivers/i2c/at91_i2c.c | 4 ++++
>  1 file changed, 4 insertions(+)

Applied to u-boot-i2c.git master

Thanks!

bye,
Heiko
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