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e100: fix length calculation in e100_get_regs_len

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commit abf9b902059f ("e100: cleanup unneeded math") tried to simplify
e100_get_regs_len and remove a double 'divide and then multiply'
calculation that the e100_reg_regs_len function did.

This change broke the size calculation entirely as it failed to account
for the fact that the numbered registers are actually 4 bytes wide and
not 1 byte. This resulted in a significant under allocation of the
register buffer used by e100_get_regs.

Fix this by properly multiplying the register count by u32 first before
adding the size of the dump buffer.

Fixes: abf9b902059f ("e100: cleanup unneeded math")
Reported-by: Felicitas Hetzelt <felicitashetzelt@gmail.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Jacob Keller 2021-09-08 10:52:36 -07:00 committed by Tony Nguyen
parent 3b1b6e82fb
commit 4329c8dc11
1 changed files with 5 additions and 1 deletions
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6
drivers/net/ethernet/intel/e100.c
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@ -2441,7 +2441,11 @@ static void e100_get_drvinfo(struct net_device *netdev,
static int e100_get_regs_len(struct net_device *netdev)
{
struct nic *nic = netdev_priv(netdev);
return 1 + E100_PHY_REGS + sizeof(nic->mem->dump_buf);
/* We know the number of registers, and the size of the dump buffer.
* Calculate the total size in bytes.
*/
return (1 + E100_PHY_REGS) * sizeof(u32) + sizeof(nic->mem->dump_buf);
}
static void e100_get_regs(struct net_device *netdev,