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Date: Sun, 17 Mar 2019 21:59:27 +0200 From: Oded Gabbay <oded.gabbay@...il.com> To: linux-kernel@...r.kernel.org Cc: gregkh@...uxfoundation.org Subject: [PATCH 15/15] habanalabs: never fail hard reset of device Hard-reset of our device should never fail, due to dangers of permanent damage to the H/W. This patch removes the last place in the reset path where the driver might exit before doing the actual reset. Signed-off-by: Oded Gabbay <oded.gabbay@...il.com> --- drivers/misc/habanalabs/device.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/drivers/misc/habanalabs/device.c b/drivers/misc/habanalabs/device.c index 77d51be66c7e..c51d1062d0bc 100644 --- a/drivers/misc/habanalabs/device.c +++ b/drivers/misc/habanalabs/device.c @@ -663,17 +663,9 @@ int hl_device_reset(struct hl_device *hdev, bool hard_reset, /* Go over all the queues, release all CS and their jobs */ hl_cs_rollback_all(hdev); - if (hard_reset) { - /* Release kernel context */ - if (hl_ctx_put(hdev->kernel_ctx) != 1) { - dev_err(hdev->dev, - "kernel ctx is alive during hard reset\n"); - rc = -EBUSY; - goto out_err; - } - + /* Release kernel context */ + if ((hard_reset) && (hl_ctx_put(hdev->kernel_ctx) == 1)) hdev->kernel_ctx = NULL; - } /* Reset the H/W. It will be in idle state after this returns */ hdev->asic_funcs->hw_fini(hdev, hard_reset); @@ -699,6 +691,13 @@ int hl_device_reset(struct hl_device *hdev, bool hard_reset, if (hard_reset) { hdev->device_cpu_disabled = false; + if (hdev->kernel_ctx) { + dev_crit(hdev->dev, + "kernel ctx was alive during hard reset, something is terribly wrong\n"); + rc = -EBUSY; + goto out_err; + } + /* Allocate the kernel context */ hdev->kernel_ctx = kzalloc(sizeof(*hdev->kernel_ctx), GFP_KERNEL); -- 2.17.1
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