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habanalabs: never fail hard reset of device

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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@gmail.com>
This commit is contained in:
Oded Gabbay 2019-03-17 09:12:29 +02:00
parent d9973871da
commit 0878a42086
1 changed files with 9 additions and 10 deletions
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19
drivers/misc/habanalabs/device.c
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@ -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 */ /* Go over all the queues, release all CS and their jobs */
hl_cs_rollback_all(hdev); hl_cs_rollback_all(hdev);
if (hard_reset) { /* Release kernel context */
/* Release kernel context */ if ((hard_reset) && (hl_ctx_put(hdev->kernel_ctx) == 1))
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;
}
hdev->kernel_ctx = NULL; hdev->kernel_ctx = NULL;
}
/* Reset the H/W. It will be in idle state after this returns */ /* Reset the H/W. It will be in idle state after this returns */
hdev->asic_funcs->hw_fini(hdev, hard_reset); 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) { if (hard_reset) {
hdev->device_cpu_disabled = false; 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 */ /* Allocate the kernel context */
hdev->kernel_ctx = kzalloc(sizeof(*hdev->kernel_ctx), hdev->kernel_ctx = kzalloc(sizeof(*hdev->kernel_ctx),
GFP_KERNEL); GFP_KERNEL);