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SubjectRe: [PATCH 1/2] bus: mhi: core: Fix parsing of mhi_flags
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Hi Mani,

On 4/13/20 5:07 AM, Manivannan Sadhasivam wrote:
> With the current parsing of mhi_flags, the following statement always
> return false:
>
> eob = !!(flags & MHI_EOB);
>
> This is due to the fact that 'enum mhi_flags' starts with index 0 and we
> are using direct AND operation to extract each bit. Fix this by using
> BIT() macro to extract each bit and make the mhi_flags index start from 1.
>
> Fixes: 189ff97cca53 ("bus: mhi: core: Add support for data transfer")
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
> drivers/bus/mhi/core/main.c | 6 +++---
> include/linux/mhi.h | 2 +-
> 2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
> index eb4256b81406..4165a853c189 100644
> --- a/drivers/bus/mhi/core/main.c
> +++ b/drivers/bus/mhi/core/main.c
> @@ -1090,9 +1090,9 @@ int mhi_gen_tre(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan,
> if (ret)
> return ret;
>
> - eob = !!(flags & MHI_EOB);
> - eot = !!(flags & MHI_EOT);
> - chain = !!(flags & MHI_CHAIN);
> + eob = !!(flags & BIT(0));
> + eot = !!(flags & BIT(1));
> + chain = !!(flags & BIT(2));

How about setting enums  with BIT macro and still use same enums above.
If flags is having MHI _CHAIN (enum value 3) but comparing with BIT(2)
(value 4) will not work.

> bei = !!(mhi_chan->intmod);
>
> mhi_tre = tre_ring->wp;
> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> index ad1996001965..22185fecbbf2 100644
> --- a/include/linux/mhi.h
> +++ b/include/linux/mhi.h
> @@ -53,7 +53,7 @@ enum mhi_callback {
> * @MHI_CHAIN: Linked transfer
> */
> enum mhi_flags {
> - MHI_EOB,
> + MHI_EOB = 1,
> MHI_EOT,
> MHI_CHAIN,
> };

enum mhi_flags {

    MHI_EOB = BIT(0),

    MHI_EOT = BIT(1),

    MHI_CHAIN = BIT(2),

}

--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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