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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: c75c9fdac6 ("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>
This commit is contained in:
Suman Anna 2021-04-07 10:56:41 -05:00 committed by Bjorn Andersson
parent 1fe72bcfac
commit 880a66e026
1 changed files with 17 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/remoteproc/pru_rproc.c
View File

@ -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;
}
@ -398,7 +411,6 @@ 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);
return 0;