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authorSuman Anna <s-anna@ti.com>2021-04-07 10:56:41 -0500
committerBjorn Andersson <bjorn.andersson@linaro.org>2021-04-13 15:43:38 -0500
commit880a66e026fbe6a17cd59fe0ee942bbad62a6c26 (patch)
tree8d6a0d0941589ef87b13b059f830713890bcd248 /drivers/remoteproc
parent1fe72bcfac087dba5ab52778e0646ed9e145cd32 (diff)
downloadlinux-880a66e026fbe6a17cd59fe0ee942bbad62a6c26.tar.bz2
remoteproc: pru: Fix and cleanup firmware interrupt mapping logic
The PRU firmware interrupt mappings are configured and unconfigured in .start() and .stop() callbacks respectively using the variables 'evt_count' and a 'mapped_irq' pointer. These variables are modified only during these callbacks but are not re-initialized/reset properly during unwind or failure paths. These stale values caused a kernel crash while stopping a PRU remoteproc running a different firmware with no events on a subsequent run after a previous run that was running a firmware with events. Fix this crash by ensuring that the evt_count is 0 and the mapped_irq pointer is set to NULL in pru_dispose_irq_mapping(). Also, reset these variables properly during any failures in the .start() callback. While at this, the pru_dispose_irq_mapping() callsites are all made to look the same, moving any conditional logic to inside the function. Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Fixes: c75c9fdac66e ("remoteproc: pru: Add support for PRU specific interrupt configuration") Reported-by: Vignesh Raghavendra <vigneshr@ti.com> Signed-off-by: Suman Anna <s-anna@ti.com> Link: https://lore.kernel.org/r/20210407155641.5501-4-s-anna@ti.com Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/remoteproc')
-rw-r--r--drivers/remoteproc/pru_rproc.c22
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
index ac6348cc094f..b13ff4283232 100644
--- a/drivers/remoteproc/pru_rproc.c
+++ b/drivers/remoteproc/pru_rproc.c
@@ -266,12 +266,17 @@ static void pru_rproc_create_debug_entries(struct rproc *rproc)
static void pru_dispose_irq_mapping(struct pru_rproc *pru)
{
- while (pru->evt_count--) {
+ if (!pru->mapped_irq)
+ return;
+
+ while (pru->evt_count) {
+ pru->evt_count--;
if (pru->mapped_irq[pru->evt_count] > 0)
irq_dispose_mapping(pru->mapped_irq[pru->evt_count]);
}
kfree(pru->mapped_irq);
+ pru->mapped_irq = NULL;
}
/*
@@ -307,8 +312,10 @@ static int pru_handle_intrmap(struct rproc *rproc)
pru->evt_count = rsc->num_evts;
pru->mapped_irq = kcalloc(pru->evt_count, sizeof(unsigned int),
GFP_KERNEL);
- if (!pru->mapped_irq)
+ if (!pru->mapped_irq) {
+ pru->evt_count = 0;
return -ENOMEM;
+ }
/*
* parse and fill in system event to interrupt channel and
@@ -317,13 +324,19 @@ static int pru_handle_intrmap(struct rproc *rproc)
* corresponding sibling PRUSS INTC node.
*/
parent = of_get_parent(dev_of_node(pru->dev));
- if (!parent)
+ if (!parent) {
+ kfree(pru->mapped_irq);
+ pru->mapped_irq = NULL;
+ pru->evt_count = 0;
return -ENODEV;
+ }
irq_parent = of_get_child_by_name(parent, "interrupt-controller");
of_node_put(parent);
if (!irq_parent) {
kfree(pru->mapped_irq);
+ pru->mapped_irq = NULL;
+ pru->evt_count = 0;
return -ENODEV;
}
@@ -398,8 +411,7 @@ static int pru_rproc_stop(struct rproc *rproc)
pru_control_write_reg(pru, PRU_CTRL_CTRL, val);
/* dispose irq mapping - new firmware can provide new mapping */
- if (pru->mapped_irq)
- pru_dispose_irq_mapping(pru);
+ pru_dispose_irq_mapping(pru);
return 0;
}