From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> To: Bjorn Andersson <bjorn.andersson@linaro.org>, Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>, Abhinav Kumar <quic_abhinavk@quicinc.com> Cc: Stephen Boyd <swboyd@chromium.org>, David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, Dan Carpenter <dan.carpenter@oracle.com> Subject: [PATCH] drm/msm/dsi: fix error checks and return values for DSI xmit functions Date: Sat, 2 Apr 2022 02:11:04 +0300 [thread overview] Message-ID: <20220401231104.967193-1-dmitry.baryshkov@linaro.org> (raw) As noticed by Dan ([1] an the followup thread) there are multiple issues with the return values for MSM DSI command transmission callback. In the error case it can easily return a positive value when it should have returned a proper error code. This commits attempts to fix these issues both in TX and in RX paths. [1]: https://lore.kernel.org/linux-arm-msm/20211001123617.GH2283@kili/ Fixes: a689554ba6ed ("drm/msm: Initial add DSI connector support") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> --- drivers/gpu/drm/msm/dsi/dsi_host.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index d51e70fab93d..8925f60fd9ec 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -1341,10 +1341,10 @@ static int dsi_cmds2buf_tx(struct msm_dsi_host *msm_host, dsi_get_bpp(msm_host->format) / 8; len = dsi_cmd_dma_add(msm_host, msg); - if (!len) { + if (len < 0) { pr_err("%s: failed to add cmd type = 0x%x\n", __func__, msg->type); - return -EINVAL; + return len; } /* for video mode, do not send cmds more than @@ -1363,10 +1363,14 @@ static int dsi_cmds2buf_tx(struct msm_dsi_host *msm_host, } ret = dsi_cmd_dma_tx(msm_host, len); - if (ret < len) { - pr_err("%s: cmd dma tx failed, type=0x%x, data0=0x%x, len=%d\n", - __func__, msg->type, (*(u8 *)(msg->tx_buf)), len); - return -ECOMM; + if (ret < 0) { + pr_err("%s: cmd dma tx failed, type=0x%x, data0=0x%x, len=%d, ret=%d\n", + __func__, msg->type, (*(u8 *)(msg->tx_buf)), len, ret); + return ret; + } else if (ret < len) { + pr_err("%s: cmd dma tx failed, type=0x%x, data0=0x%x, ret=%d len=%d\n", + __func__, msg->type, (*(u8 *)(msg->tx_buf)), ret, len); + return -EIO; } return len; @@ -2092,9 +2096,12 @@ int msm_dsi_host_cmd_rx(struct mipi_dsi_host *host, } ret = dsi_cmds2buf_tx(msm_host, msg); - if (ret < msg->tx_len) { + if (ret < 0) { pr_err("%s: Read cmd Tx failed, %d\n", __func__, ret); return ret; + } else if (ret < msg->tx_len) { + pr_err("%s: Read cmd Tx failed, too short: %d\n", __func__, ret); + return -ECOMM; } /* -- 2.35.1
WARNING: multiple messages have this Message-ID (diff)
From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> To: Bjorn Andersson <bjorn.andersson@linaro.org>, Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>, Abhinav Kumar <quic_abhinavk@quicinc.com> Cc: David Airlie <airlied@linux.ie>, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, Stephen Boyd <swboyd@chromium.org>, freedreno@lists.freedesktop.org, Dan Carpenter <dan.carpenter@oracle.com> Subject: [PATCH] drm/msm/dsi: fix error checks and return values for DSI xmit functions Date: Sat, 2 Apr 2022 02:11:04 +0300 [thread overview] Message-ID: <20220401231104.967193-1-dmitry.baryshkov@linaro.org> (raw) As noticed by Dan ([1] an the followup thread) there are multiple issues with the return values for MSM DSI command transmission callback. In the error case it can easily return a positive value when it should have returned a proper error code. This commits attempts to fix these issues both in TX and in RX paths. [1]: https://lore.kernel.org/linux-arm-msm/20211001123617.GH2283@kili/ Fixes: a689554ba6ed ("drm/msm: Initial add DSI connector support") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> --- drivers/gpu/drm/msm/dsi/dsi_host.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index d51e70fab93d..8925f60fd9ec 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -1341,10 +1341,10 @@ static int dsi_cmds2buf_tx(struct msm_dsi_host *msm_host, dsi_get_bpp(msm_host->format) / 8; len = dsi_cmd_dma_add(msm_host, msg); - if (!len) { + if (len < 0) { pr_err("%s: failed to add cmd type = 0x%x\n", __func__, msg->type); - return -EINVAL; + return len; } /* for video mode, do not send cmds more than @@ -1363,10 +1363,14 @@ static int dsi_cmds2buf_tx(struct msm_dsi_host *msm_host, } ret = dsi_cmd_dma_tx(msm_host, len); - if (ret < len) { - pr_err("%s: cmd dma tx failed, type=0x%x, data0=0x%x, len=%d\n", - __func__, msg->type, (*(u8 *)(msg->tx_buf)), len); - return -ECOMM; + if (ret < 0) { + pr_err("%s: cmd dma tx failed, type=0x%x, data0=0x%x, len=%d, ret=%d\n", + __func__, msg->type, (*(u8 *)(msg->tx_buf)), len, ret); + return ret; + } else if (ret < len) { + pr_err("%s: cmd dma tx failed, type=0x%x, data0=0x%x, ret=%d len=%d\n", + __func__, msg->type, (*(u8 *)(msg->tx_buf)), ret, len); + return -EIO; } return len; @@ -2092,9 +2096,12 @@ int msm_dsi_host_cmd_rx(struct mipi_dsi_host *host, } ret = dsi_cmds2buf_tx(msm_host, msg); - if (ret < msg->tx_len) { + if (ret < 0) { pr_err("%s: Read cmd Tx failed, %d\n", __func__, ret); return ret; + } else if (ret < msg->tx_len) { + pr_err("%s: Read cmd Tx failed, too short: %d\n", __func__, ret); + return -ECOMM; } /* -- 2.35.1
next reply other threads:[~2022-04-01 23:11 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-04-01 23:11 Dmitry Baryshkov [this message] 2022-04-01 23:11 ` [PATCH] drm/msm/dsi: fix error checks and return values for DSI xmit functions Dmitry Baryshkov 2022-04-05 16:28 ` Abhinav Kumar 2022-04-05 16:28 ` Abhinav Kumar 2022-04-16 9:12 ` Marijn Suijten 2022-04-16 9:12 ` Marijn Suijten 2022-04-16 18:10 ` Dmitry Baryshkov 2022-04-16 18:10 ` Dmitry Baryshkov
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20220401231104.967193-1-dmitry.baryshkov@linaro.org \ --to=dmitry.baryshkov@linaro.org \ --cc=airlied@linux.ie \ --cc=bjorn.andersson@linaro.org \ --cc=dan.carpenter@oracle.com \ --cc=daniel@ffwll.ch \ --cc=dri-devel@lists.freedesktop.org \ --cc=freedreno@lists.freedesktop.org \ --cc=linux-arm-msm@vger.kernel.org \ --cc=quic_abhinavk@quicinc.com \ --cc=robdclark@gmail.com \ --cc=sean@poorly.run \ --cc=swboyd@chromium.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.